Intrinsic Meron Spin Textures in Generic Focused Fields

Area of Science:

• Optics and Photonics
• Topological Physics

Background:

• Nontrivial topological optical spin textures are crucial for structured light and photonic information processing.
• Current methods for generating these textures often require complex external wavefront engineering, limiting their universal applicability and robustness.

Purpose of the Study:

• To uncover and experimentally verify an intrinsically generated meronlike spin texture in focused optical fields.
• To investigate the robustness of this intrinsic spin texture against various input perturbations.

Main Methods:

• Theoretical analysis of light focusing.
• Experimental verification of the meronlike spin texture using optical measurements.
• Testing robustness against partially polarized and spatially disordered inputs, decoherence, and depolarization.

Main Results:

• An intrinsic meronlike spin texture was successfully uncovered and experimentally verified in focused optical fields.
• This intrinsic texture demonstrated exceptional robustness against noise, including partial polarization, spatial disorder, decoherence, and depolarization.
• The resilience is attributed to the natural focusing process and topological protection from phase vortices.

Conclusions:

• A naturally occurring, intrinsically generated spin texture with remarkable robustness has been identified.
• This discovery complements existing externally engineered topological spin textures.
• It provides new components for topological spin textures in optics, enhancing potential for disorder-resilient photonic applications.